Here are some pics of a slate roof we worked on yesterday. Very very heavy Lichen, HO let this one go way too long but! being the 1st roof cleaning company in this area there was no one to clean it before now. I told the HO it will take up to 6 months for the lichen to fall off.
We love cleaning slate and restoring the beauty without the use of a pressure washer. Great work soft washing that slate roof.
Fred W said
Aug 17, 2014
One ugly roof for sure!
ReNew Roof and Exterior cleaning said
Aug 17, 2014
Thanks Eric, hopefully all that lichen WILL come off over time
Liberty SoftWash said
Aug 17, 2014
It will come off!
Mario said
Aug 17, 2014
6 months was a good time line for the roof to clean up
ginty said
Aug 17, 2014
Thats thick looking lichen
will it not scrape of with a floor scraper or garden hoe ,at an extra cost plus a re application of mix cost
Liberty SoftWash said
Aug 17, 2014
You don't want to scrap it or pick it, soft wash it and charge right the first time. We try not to mess with the slate as sometimes they are brittle from the years of weather.
ginty said
Aug 17, 2014
yeah can see that now its not as easy as moss to leave the surface best to let nature fix what nature caused .would an infestation as bad as that not require a double amount of mix just to penetrate the lichen
Liberty SoftWash said
Aug 17, 2014
2 coats of a slate mix and it will take 6 months to a yr to come off. Soft washing the right way!
ReNew Roof and Exterior cleaning said
Aug 17, 2014
I sprayed it heavy with a 60/40 mix water/sh and kept spraying just keeping it wet for at least 30 minutes. I wanted to make sure everything was penetrated so I knew it was all dead.
-- Edited by ReNew Roof and Exterior cleaning on Sunday 17th of August 2014 04:52:34 PM
SprayWash said
Aug 18, 2014
Man, you could have mowed that thing! Nice work!
Ed Thompson said
Aug 18, 2014
Nice! Love slate.
ReNew Roof and Exterior cleaning said
Aug 18, 2014
Thanks Ray. Ya that chit was pretty thick. He only wanted the north side of the roof done. We used 70 gallons of mix on slate roof, shingle half garage and gazzabo with cedar shingles. Customer is happy. Everything is brown now, cedar shingles lightened just enough from dark brown to natural. I left the mix on the cedar for about 10-15 minutes. I will go back in a few months and take more pics.
ReNew Roof and Exterior cleaning said
Aug 18, 2014
Thanks Ed
RIP Rapid HotClean said
Aug 19, 2014
Gene, nice work on a nasty roof. I agree with you on spraying long and heavy. Returning to do it again sucks!
Dave O said
Aug 20, 2014
We cleaned a glazed slate roof recently. We used a 50/50 mix since the house had gutters and sprayed three light coats. That kept it wet long enough to cook without much run-off. We then rinsed it and the moss and licken washed off quite easily.
ReNew Roof and Exterior cleaning said
Aug 20, 2014
Thanks Ted.....Dave, I had a lot of run off but there were just pea stone under the eaves. The lichen was very thick and had to saturate it. It still seemed like I didnt quite use enough. A lot of the thinner lichen came right off with a light rinse but the thicker stuff is on there for a while.
Patrick G said
Aug 20, 2014
You might want to brush up on what happens to slate when it hits a certain age...Like 40 yrs on up. When that moss and Lichen comes off you might receive a phone call from the cutomer with some questions. Being up to date will help.
ReNew Roof and Exterior cleaning said
Aug 21, 2014
Ok...Im thinking it will probably be spotty? However, can you point me in the right direction Patrick?
ReNew Roof and Exterior cleaning said
Aug 21, 2014
I found your post on slate delamination. Good info Patrick.
Dan said
Aug 30, 2014
I've read that you don't use soap in the mix. Is there some surfactant that is appropriate for slate?
I have a window customer I drive by almost daily and their slate roof needs help. I've not said anything to them yet.
Ed Thompson said
Aug 30, 2014
I love the cast iron vent made of scrap pieces. The upside down connection is a dead give away. Though this roof probably belongs to a house that I couldnt afford, it doesnt stop me from critique.
Here are some pics of a slate roof we worked on yesterday. Very very heavy Lichen, HO let this one go way too long but! being the 1st roof cleaning company in this area there was no one to clean it before now. I told the HO it will take up to 6 months for the lichen to fall off.
will it not scrape of with a floor scraper or garden hoe ,at an extra cost plus a re application of mix cost
I sprayed it heavy with a 60/40 mix water/sh and kept spraying just keeping it wet for at least 30 minutes. I wanted to make sure everything was penetrated so I knew it was all dead.
-- Edited by ReNew Roof and Exterior cleaning on Sunday 17th of August 2014 04:52:34 PM
Thanks Ed
I have a window customer I drive by almost daily and their slate roof needs help. I've not said anything to them yet.